C - How to append a char to char

Question

I ve tried so may ways on the Internet to append a character to a char  but none of them seems to work  Here is one of my incomplete solution   char  appendCharToCharArray char   array  char a        char  ret           if  array                     char   ret   new char strlen array    1   1        1 char   1 for null          strcpy ret array             else               ret   new char 2           strcpy ret array              ret strlen array     a       1      ret strlen array  1      0       return ret      This only works when the passed array is     blank inside   Otherwise it doesn t help  and got an error at  1    Could you guys please help me with this   Thanks so much in advanced

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char ch    t   char chArray 2   sprintf chArray    c   ch   char chOutput 10   tes   strcat chOutput  chArray   cout lt  lt chOutput    OUTPUT   test

User · Answer

Remove those char   ret declarations inside if blocks which hide outer ret  Therefor you have memory leak and on the other hand un-allocated memory for ret   To compare a c-style string you should use strcmp array     not array      Your final code should looks like below   char  appendCharToCharArray char  array  char a        size t len   strlen array        char  ret   new char len 2        strcpy ret  array           ret len    a      ret len 1      0        return ret      Note that  you must handle the allocated memory of returned ret somewhere by delete   it    nbsp   Why you don t use std  string  it has  append method to append a character at the end of a string   std  string str   str append  x       or str    x

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The function name does not reflect the semantic of the function  In fact you do not append a character  You create a new character array that contains the original array plus the given character  So if you indeed need a function that appends a character to a character array I would write it the following way  bool AppendCharToCharArray  char  array  size t n  char c         size t sz   std  strlen  array         if   sz   1  lt  n                  array sz    c          array sz   1      0                     return   sz   1  lt  n         If you need a function that will contain a copy of the original array plus the given character then it could look the following way  char   CharArrayPlusChar  const char  array  char c         size t sz   std  strlen  array        char  s   new char sz   2        std  strcpy  s  array        s sz    c      s sz   1      0        return   s

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The specific problem is that you re declaring a new variable instead of assigning to an existing one   char   ret   new char strlen array    1   1          Remove this   and trying to compare string values by comparing pointers   if  array             Wrong - compares pointer with address of string literal if  array 0     0     Better - checks for empty string   although there s no need to make that comparison at all  the first branch will do the right thing whether or not the string is empty   The more general problem is that you re messing around with nasty  error-prone C-style string manipulation in C    Use std  string and it will manage all the memory allocation for you   std  string appendCharToString std  string const  amp  s  char a        return s   a

[c++] C++ - How to append a char to char*?

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